Improvement in heating-stoves



J. E GRIDLE'Y. f

Heating-Stove.

No. 216,178. Patented June 3,1879.

WASHINGTON D c ,IINITED STATES PATENT Or-Frea 4 JAMES E. GRIDLEY, OFCHICAGO, ILLINOIS.

IMPROVEMENT IN HEATING-STOVES.

Specification forming part of Letters Patent No. 216,178, dated June 3,1879 application filed May 23, 1818.

To all whom it may concern:

Be it known that I, JAMES E. GRIDLEY, of the city of Chicago, and Stateof Illinois, have invented a new and useful Improvement inHeating-Stoves, of which the following, taken together with theaccompanying drawings therein referred to, is a full and accuratespecification.

My invention relates to that class of heatin gstoves known asbase-burners or self-feeders, in which a centrally-located coal-magazineis suspended over the fire-pot, for the automatic supply of coal theretoas consumption proceeds.

It consists in an air-heatin g chamber ordrum arranged in combinationwith the magazine, and provided with bottom and top openings for thereception and discharge of air; in the combination, with both drum andmagazine, of heat and air deflecting plates, as more fully describedbelow.

Figure 1 of the drawings shows a heatingstove of the class mentioned invertical median section from front to back. Fig. 2 is a horizontalsection of the upper portion, taken below the smoke-flue.

S is the shell of the stove; G, the grate; F, the fire-box, and M thecoal-magazine. About the magazine is arranged concentric therewith theannular chamber A, intended to afford a passage for air through theinterior of the stove and to heat the same-i. 0., the airrapidly. Thisair heating chamber is wholly cut off from communication with thefire-chamber surrounding it, but is open at the bottom through the flueA and at the top through the annular space about the magazine, (shown inthe draw ings,) so that as the air is heated it rises, and a constantcurrent is maintained.

In order to more completely abstract the heat from the fire-chamber andfrom the products of combustion as they rise to the smokeflue, thedeflecting-plate dis placed in the heatpassage surrounding theair-chamber. It is provided with an opening, m, in front, and throughthis opening the hot gases have their course in the direction of thearrows f. In this manner an extended surface of the outer wall inclosingthe chamber is exposed to contact With them.

Within the chamberAacorresponding plate, a, is arranged, preferably inthe same plane, or nearly the same plane, with d, thus directing the airinto contact with the most highly-heated portions of the drum-walls, asshown by the arrows at. Several of these deflecting-plates may be placedin each chamber, their openin gs h m being arranged to give to thecourse of the hot gases and of the air any desired degree of sinuosity,and effecting thereby the most complete transfer of heat from the formerto the latter.

In the plates 01 may be placed valves 8, to give direct draftfrom thefire-bed to the smokeflue when desired.

The base plate or ring of the air-chamber is located as near thefire-bed as practicable without obstructing the fire-light or preventingradiation through the central illuminated portion of the stove-shell.

The magazine-mouth always extends below the base-plate of the airchamberinto proper relation with the fire-pot, insuring a suitable space alwaysbetween the air-chamber and the fire-bed. When the air-chamber is madethus low in the fire-chamber, the annular space cis provided below theconnection of the air-chamber and the magazine, both for the purposes ofexposing a larger surface of the air-chamber base to'the radiations ofthe fire, and also to prevent the cracking of the base-casting fromunequal temperature, particularly when fresh coal is applied to thelower portion of the magazine. 7

To avoid the admission of coal into the airchamber while filling themagazine, the latter is extended above the air-escape, and is madeflaring at the top, as shown, or is suitably flanged to protect theopening into the airchamber. The plate T also is curved upward at itsinner margin.

An annular register with either vertical, inclined, or horizontalopenings may be applied at this point with the double purpose ofprotecting the airchamber and" regulating the passage of heated air.

Provision for the egress of heated air may, however, be made immediatelybeneath the top plate of the stove, and the magazine in that case may begiven the usual form and connection at the top without impairing theeffectiveness of the air-heating devicess Having thus described myinvention, I claim and desire to secure by Letters Patent-'-Aheating-stove provided with a central coallnagazine, an annularair-chamber external to and concentric with the magazine, and a smokespace or passage exterior to the air-chamber,

and having the heat deflector d and air-deflector 0, arranged in theseveral chambers, substantially as shown and described, and for thepurposes set forth.

' JAMES E. GRIDLEY. Witnesses:

JEssE 00X, Jr., A. MOORE.

